Move screen capturers from remoting/capturer to media/video/capturer/screen

remoting/capturer/differ.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef REMOTING_CAPTURER_DIFFER_H_
-#define REMOTING_CAPTURER_DIFFER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "third_party/skia/include/core/SkRegion.h"
-
-namespace remoting {
-
-typedef uint8 DiffInfo;
-
-// TODO: Simplify differ now that we are working with SkRegions.
-// diff_info_ should no longer be needed, as we can put our data directly into
-// the region that we are calculating.
-// http://crbug.com/92379
-// TODO(sergeyu): Rename this class to something more sensible, e.g.
-// VideoFrameDifferencer.
-class Differ {
- public:
-  // Create a differ that operates on bitmaps with the specified width, height
-  // and bytes_per_pixel.
-  Differ(int width, int height, int bytes_per_pixel, int stride);
-  ~Differ();
-
-  int width() { return width_; }
-  int height() { return height_; }
-  int bytes_per_pixel() { return bytes_per_pixel_; }
-  int bytes_per_row() { return bytes_per_row_; }
-
-  // Given the previous and current screen buffer, calculate the dirty region
-  // that encloses all of the changed pixels in the new screen.
-  void CalcDirtyRegion(const void* prev_buffer, const void* curr_buffer,
-                       SkRegion* region);
-
- private:
-  // Allow tests to access our private parts.
-  friend class DifferTest;
-
-  // Identify all of the blocks that contain changed pixels.
-  void MarkDirtyBlocks(const void* prev_buffer, const void* curr_buffer);
-
-  // After the dirty blocks have been identified, this routine merges adjacent
-  // blocks into a region.
-  // The goal is to minimize the region that covers the dirty blocks.
-  void MergeBlocks(SkRegion* region);
-
-  // Check for diffs in upper-left portion of the block. The size of the portion
-  // to check is specified by the |width| and |height| values.
-  // Note that if we force the capturer to always return images whose width and
-  // height are multiples of kBlockSize, then this will never be called.
-  DiffInfo DiffPartialBlock(const uint8* prev_buffer, const uint8* curr_buffer,
-                            int stride, int width, int height);
-
-  // Dimensions of screen.
-  int width_;
-  int height_;
-
-  // Number of bytes for each pixel in source and dest bitmap.
-  // (Yes, they must match.)
-  int bytes_per_pixel_;
-
-  // Number of bytes in each row of the image (AKA: stride).
-  int bytes_per_row_;
-
-  // Diff information for each block in the image.
-  scoped_array<DiffInfo> diff_info_;
-
-  // Dimensions and total size of diff info array.
-  int diff_info_width_;
-  int diff_info_height_;
-  int diff_info_size_;
-
-  DISALLOW_COPY_AND_ASSIGN(Differ);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_CAPTURER_DIFFER_H_